Isviprovesviemt in moldlng-iv achines



T. F. HAMMER.

Molding-Machine.

Patented I ri THE GRAPHIC C0.PHOTO .-LITH.39 8:.41 PARK PLACE, N.Y.

Uivrran Sraras ParanrrWQsr-rrea;

THORVALD F. HAMMER, OF BRANFORD, CONNECTICUT.

IMPROVEMENT IN MOLDING-MACHINES.

Spec'ficati 11 forming part of Letters Patent No. 61,784, dated April 6,1875; application filed February 25, 1875.

To all whom it may concern:

Be it known that I, THORVALD F. HAMMER, of Branford, in the county ofNew Haven and State of Connecticut, have invented a newlVIolding-lllachine; and I do hereby declare the following,when-taken inconnection with the accompanying drawings and the letters of referencemarked thereon, to be a full, clear, and exact description of the same,and which said drawings constitute part of this specification, andrepresent iu-- Figure 1 a front view; Fig. 2, a side View; Figs. 3, 4,5, detached views.

This invention relates to an improvement in machines for forming moldspreparatory to making metal castings, the object being to avoid theusual camping, and thereby facilitate the preparation of the mold.

The invention consists in a stationary bed, combined with a movableplaten above the bed, and mechanism for moving said platen toward andfrom the bed, and the said platen also hung so as to be turned laterallyaway from over the bed, as more fully hereinafter described.

The invention further consists in a thin hoop set within the flask atits upper edge, so as to project above the flask, to allow the bankingof the sand, but so that when the platen is brought down upon the'sandand hoop, the hoop will be pressed into the flask with the sand, as morefull'y hereinafter described.

The invention further consists in an extensible plug for forming thesprue, as hereinafter described.

A is the stationary bed of the machine mounted on uprights B B. C is theplaten, mounted on rods D D, the said rods attached to a horizontalshaft, E, below. On the shaft E is a spring, F, (may be weight or otherequivalent device,) the tendency of which is to turn the shaft forwardand hold the rods D up against a shoulder, d, on the bed, this positionbringing the platen transversely parallel to the bed, as seen in Fig. 2,the spring allowing the shaft to be turned so as to carry the platentransversely back from over the bed, as denoted in broken lines in, Fig.2. The shaft E rests in a block, G, at each end, these blocks workingfreely up and down in a slot, H, in the uprights B. Below the shaft E isa rock-shaft, L, parallel to the shaft E, on which are two cranks, N,each of which connect by a rod, 1?, to the shaft E. The shaft L isturned by means of a lever, B, so that by forcing the lever B back tothe position denoted in broken lines 2, the shaft E, and with it theplaten C, will be raised, as denoted in broken lines, or by drawing thelever forward the platen C will be drawn down accordingly.

This completes the construction of the machine. The bed A forms themolding-bench. On this (the platen having been turned back) the parts 8s of a match-flask are placed, the pattern arranged between the two inthe usual manner, the lower part having been previously prepared tosupport the pattern. The upper part is then filled with sand a littlemore than fullthat is, so that the sand will project above the flask tothe extent of the compression desired; then onto this sand the board Tis placed, and the platen C turned forward over the board, and by meansof the lever B forced down onto the sand to compress it in the flask;or, if desired, the board may be left off, and the platen broughtdirectly onto the sand, and then the board applied for the removal ofthe flask in the usual manner.

This completes the molding, and the usual labor of tainping is avoided,and an even compression of the sand attained.

The platen is made adjustable relatively to the bed by nuts W. In orderto conveniently bank the sand in the flask, and at the same time be ableto strike off the surplus, I place in the flask at the upper edge a thinhoop, a, as seen in Fig. 3,-projecting above the surface of the flask tothe extent required for banking the sand. The surplus may be struck offto this hoop in the usual manner; then when the platen is brought downthe hoop will pass down into the flask with the sand, to remain there,or be removed for use in other flasks.

To form the opening for the sprue I make the plug extensiblethat is, anexternal tube or sleeve, 02, with an internal follower, m, and a spring,1, to force the follower an outward, the follower prevented fromescaping entirely from the sleeve by a headed spindle, t, as seen inFig. 5. This is set into the mold, and its height when extended isgreater than the depth of the flask, and the banking hence will projectabove the flask, as denoted in broken lines, Fig. 5; but when the platenis brought down it will force the sleeve onto the follower down flushwith the flask, as seen in Fig. 4, and when the pressure is removed thesleeve will be forced from the sand, and afford a handle by which todraw the plug from the sand, and leave the hole for the sprue in thedesired form.

I do not, broadly, claim an attachment to orauxiliary part of the flask,whereby the sand may be banked prior to compression, as such I am awareis not new.

I clain1 l. The combination of the stationary bed A, the platen O, hungby rods D to the shaft E, the spring F for turning said shaft, therockshaft L, connected to the shaft E, and the lever R, substantially asdescribed.

